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Varnish for Waterproof Goods

Let 1 pound of India-rubber, in small pieces, soften in 1 pound of oil of turpentine, then add 2 pounds boiled oil, and let the whole boil for 2 hours over a slow coal fire. When dissolved, add again 6 pounds boiled linseed oil and 1 pound litharge, and boil until an even liquid is obtained. It is applied warm, and forms a waterproof coating.